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Sound Waves
Sound waves are a mechanical oscillation of pressure. It is a series of vibrations that can be heard.
604 Questions
What is the definition of rarefaction?
Bill Crawley Reference librarian Illinois Central College According to the Oxford English Dictionary... The action of rarefying, or process of being rarefied; diminution of density. (Now chiefly of the air or gases, or Path. of bones.) 1603 HOLLAND Plutarch's Mor. 1318 To clense and purifie the aire by this rarefaction and subtilization. 1626BACON Sylva §30 In Gunpowder, the Force of it hath been ascribed to Rarefaction of the Earthy Substance into Flame. 1707 FLOYER Physic. Pulse-Watch 69 In those Persons who have the best Tempers, the Blood and Spirits have a moderate Rarifaction. 1869 E. A. PARKES Pract. Hygiene (ed. 3) 466 In ascending mountains there is rarefaction, i.e. lessened pressure of air. 1898 Allbutt's Syst. Med. V. 605 In others there is..thickening or rarefaction of skull bones.
fig. 1672 MARVELL Reh. Transp. (1675) II. 249 Lest they [laws]..lose in strength what they gain by extension and rarefaction. 1873 SYMONDS Grk. Poets vi. 171 Arriving at monotheism by a process of rarefaction and purification. b. With a and pl. An instance of this. 1834 M. SOMERVILLE Connex. Phys. Sc. xvi. (1849) 144 A regular series of condensations and rarefactions. 1873 W. LEES Acoustics I. i. 10 An undulation or wave..consists of two partsa condensation and a rarefaction.
The 4 Basic Wave interactions are?
The four basic wave interactions are reflection, refraction, diffraction, and interference. Reflection occurs when a wave bounces off a surface, while refraction involves the bending of a wave as it passes through a different medium. Diffraction is the bending of waves around obstacles, and interference is the interaction of waves, leading to their reinforcement or cancellation.
What kinds of waves are sound waves?
sound waves are compression waves, or longitudinal waves. sounds that we hear are actually just compressions and rarefactions of air particles, meaning the air particles move closer together for a time period then spread apart farther then they normally would rarefaction)
SONAR was invented to detect underwater threats, such as submarines and mines, during World War I. It uses sound waves to detect objects underwater by emitting pulses of sound and listening for echoes. SONAR has since been used for various applications, including navigation, mapping the seafloor, and studying marine life.
Compression happens during which part of the sound wave?
Compression happens during the part of the sound wave where the air particles are pushed closer together, resulting in an increase in air pressure. This creates a region of higher pressure within the sound wave, causing the compression of the air particles.
What are the characteristics of waves?
Waves transfer energy. Energy is the ability to do work or cause change. A wave is temporary in other words the waves don't last long. Waves always travel through a medium. The mediums can be solid, liquid, or gas. All the waves that need a medium to transfer energy are called mechanical waves. There are some kinds of waves that can travel without a medium. They are called electromagnetic waves. Mechanical waves are produced when the medium starts vibrating. To vibrate is to move up and down or back and forth repeatedly.
There are two kind of mechanical waves. They are longitudinal waves and transverse waves. Transverse waves move the medium at a right angle to the direction the wave is moving. The transverse waves have crests and troughs. The crest is the highest part of a of the wave and the trough is the lower part of the wave. The longitudinal waves move the medium parallel to the direction the wave is moving. Longitudinal waves have compressions and rare fractions. The compression in a longitudinal wave in the part where the particles are close together, rarefaction is when the particles are spread out. A longitudinal wave is like a wave in the springs and the transverse waves are like the waves that you can make with a rope.
The figure above shows the amplitude and wavelength of the transverse wave. The amplitude is the distance from the medium to the crest. The wavelength is the distance between crest to crest or from trough to trough. A wave also has a frequency. A frequency of a wave is the amount of waves that pass through a point in a certain amount of time. The frequency of waves is measured in hertz or Hz.
In a wave speed, frequency, and wavelength are much related. For example to find the speed of a wave you have to multiply wavelength time's frequency. To find wavelength you need to divide speed divided by frequency. To find the frequency you divide speed divided by wavelength.
Waves can bounce back when they hit a surface. Reflection is when an object bounce back when it hits a surface. When an object is reflected the angle of reflection is equal to the angle of the incidence. When a wave goes into a new medium the speed of the wave changes. The change of speed May cause the wave to bend. This is called refraction.
Waves can diffract. Diffract means to spread out or bend around something. In other words waves can spread out everywhere. Like the picture above. When waves meet they interfere. There are two kinds of interference: constructive and destructive interference. Constructive interference is when two identical waves add up to make another kind of wave. The destructive interference is when two opposite waves add up to make another kind of wave.
The Earth can produce some waves that are called seismic waves. Seismic waves are wave that are made by earthquakes. Seismic wave have two kinds of waves S waves and P waves. Seismic waves that are longitudinal waves are the P waves. The seismic waves that are transverse waves are the S waves. Surface waves are waves that are both transverse waves and longitudinal waves that travel on the surface of their medium. Earthquakes under water can make a big surface waves that we know as tsunamis. Tsunamis are waves that can travel really far.
Using a seismograph, you can know that an earthquake is coming. A seismograph is an instrument that is used to see the vibration on earth or on an object.
Waves are formed by disturbance of particles of the medium. It may be longitudinal or mechanical.
In mathematics and science, a wave is a disturbance that travels through space and time, usually accompanied by the transfer of energy. Waves travel and the wave motion transfers energy from one point to another, often with no permanent displacement of the particles of the medium, that is, with little or no associated mass transport. They consist instead of oscillations or vibrations around almost fixed locations. For example, a cork on rippling water will bob up and down, staying in about the same place while the wave itself moves onwards.
One type of wave is a mechanical wave, which propagates through a medium in which the substance of this medium is deformed. The deformation reverses itself owing to restoring forces resulting from its deformation. For example, sound waves propagate via air molecules bumping into their neighbors. This transfers some energy to these neighbors, which will cause a cascade of collisions between neighboring molecules. When air molecules collide with their neighbors, they also bounce away from them (restoring force). This keeps the molecules from continuing to travel in the direction of the wave.
Another type of wave can travel through a vacuum, eg., electromagnetic radiation (including visible light, ultraviolet radiation, infrared radiation, gamma rays, x-rays, and radio waves). This type of wave consists of periodic oscillations in electrical and magnetic fields.
A main distinction is between transverse waves, in which the disturbance occurs in a direction perpendicular (at right angles) to the motion of the wave, and longitudinal waves, in which the disturbance is in the same direction as the wave.
A buzzer is any mechanical, electromechanical, electronic, etc. device designed to produce a buzzing sound or vibration when activated. Some examples are:
- joy buzzer, a mechanical device used for practical jokes that is held in the palm and activated when the jokester shakes hands, causing an unpleasant vibration in the palm of the victim (shown in image above)
- electric buzzer, an electromechanical device that produces a buzzing noise and activated by connecting to electrical power
- piezo buzzer, an electronic device using the vibrations of a flat disk of piezoelectric material to produce a buzzing noise and activated by enabling it controlling electronic circuit
Energy that can move through empty spaces?
Moving is a relative fact: an object moving in a reference system (for example a train as observed from the station by a still observer) can be still in another reference system (for example the same train as seen by a car moving with the same velocity).
What is relevant is to accelerate (for example to start a movement in a reference where the object was still or to stop it). To accelerate a force is needed.
In empty space accelerating is essentially possible due to the so called momentum conservation law.
It states that the product of mass by velocity of an insulated system (no relation with other systems) cannot change in absence of forces.
Let us consider a car on a road: the force rotating the wheels comes from the car: it cannot directly change the car velocity. However, the contact between the wheels and the road causes a reaction from the road due to attrition. This is an external force: the car is not an insulated system and it can accelerate or stop.
In empty space this kind of propulsion is not possible.
Let us consider a rocket. Due to the action of the engine it trows out a mass (for example m1) in unit time from the jet at a speed v1.
The system before expulsion has a momentum (m+m1) v, where m is the rocket mass after the expulsion and v the rocket speed before the expulsion.
It has to be equal after the expulsion, thus, calling v2 the speed after the expulsion and considering that the mass m1 have a speed -v1 (opposite to the rocket direction) it is
(m+m1) v = m v2 -m1 v1
thus the velocity after the expulsion is v2=( (m+m1) v+m1 v1)/m > v. An acceleration has been obtained and the rocket increases its velocity :-))
The expulsion can be due to different causes, it depends on the used engine. Generally it is caused by a liquid fuel used in a turbine.
How can the interference of two sound waves produce a louder sound?
Yes as a matter of fact it can. for example take two stones and go to a like throw one in the water and shortly after throw the other one within three feet of the first stone. Now view the ripples. Like sound the ripples crated from one emission can effect and enlargen the ripples from another.
No, there is no sound in space because there is no air.Without air sound will not travel anywhere. Sound is created by a wave moving. For a wave to move, it needs a medium. Sound travels in air or water. There is no air or water in the vacuum of space.
Believe it or not...this is actually false.
An amazingly sensitive microphone, in a sense, was used to discover the constant B-flat coming from a black hole. (This found on NASA's website. Based on research from NASA's Chandra X-ray Observatory."
This comes from the Space.com website...
"Sound can travel through space, because space is not the total vacuum it's often made out to be. Atoms of gas give the universe a ubiquitous atmosphere of sorts, albeit a very thin one. Sound, unlike light, travels by compressing a medium. On Earth, the atmosphere works well as a sound-carrying medium, as does water. The planet itself is very adept at transmitting an earthquake's seismic waves, a form of sound. Space, though not as efficient, can also serve as a medium. If a brave and clever astronaut could safely remove her helmet and shout into the cosmos, her voice would carry."
Also do keep in mind that actually their are tons of particles in space. Just not near as many parts per million as here on Earth. As a matter of fact NASA has even released such research on this to attempt to solve a problem with near light speed travel. Hydrogen atoms would bombard the front of the craft at high rates of speed. Essentially such a collision of particles would break up the vehicle in a short amount of time. This alone proves space isn't a pure void. Besides...their is nothing to force all the molecules in the universe to stay attached to everything. Therefore it only seems logical to assume some do escape into the "void" we know as space.
No, animals have different ranges of hearing. Some animals can hear higher frequencies than humans, while others can hear lower frequencies. Additionally, some animals can hear sounds at much greater distances than humans.
For any wave, the wavelength,l = c/f. Rearranging this, f=c/l. The speed of sound at room temperature is about 300 m/s, so an 8 m wave would have frequency of 300 m/s /8 m =37.5 cycles/s, a little bit lower than the E string on a bass guitar, which is the same as the fifth white key on a piano.
What soccer stadium has the loudest atmosphere pound for pound in terms of decibel levels?
Inonu Stadium located in Istanbul, Turkey is home to soccer club Besiktas JK. During a Champions League match versus Liverpool on October 24, 2007, Besiktas fans, better known as Carsi, were recorded at 132 decibels. This is the highest recorded and documented sound level at a soccer stadium, everything else is hear-say. I was one of the lucky people who witnessed this feat and believe me the whole place was vibrating from the noise. To put the magnitude of the sound into perspective 132 decibels is somewhere between the sound of a jumbo jet taking off in your living room and lightening striking one meter away from you.
What three general kinds of body parts do sound waves travel through before they reach the brain?
Sound waves travel through the outer ear, middle ear, and inner ear before they reach the brain. In the outer ear, sound waves are collected by the ear canal and directed to the eardrum. Then, in the middle ear, the sound waves cause the three tiny bones (hammer, anvil, and stirrup) to vibrate. Finally, in the inner ear, the vibrations are transformed into electrical signals that are sent to the brain via the auditory nerve.
How long will it take sound waves to reach you if the source is 40 kilometers away?
Sound travels at about 330m/s in normal air.
First put 40km into metres which is 40,000m.
We can then rearrange the distance=speed x time equation to time=distance/speed.
After this we can just substitute in the values so that time=40,000/330=121.21212
Therefore it would take 121.21 seconds (about two minutes) for sound to travel 40km.
What are the disadvantages of sonic weapons?
You can use sonic weapons against a crowd but not against specific individuals, because sound tends to spread out over a wide area. Also, while you can certainly make sounds loud enough to annoy people or even to cause hearing loss, it is difficult (although not impossible) to make sounds loud enough to kill people. You may not want to kill people, of course, but in the case of weapons you usually do want to at least have that option.
What type of sound wave is produed in violin?
The sound wave produced by a violin is a complex waveform with multiple harmonics. It is generated by the vibration of the strings, which are then transmitted to the body of the instrument and amplified through the resonance of the hollow body. This combination of harmonics gives the violin its unique and rich tone.
The sound made by an emu can best be described as a deep-throated "drumming". They are able to fill their throat pouches with air, generating a drumming sound that can be heard several kilometres away.
What is the highest frequency of sound that most humans can hear?
4000 Hz is wrong, since your hearing is very sensitive at a younger age. A averge 30-40 year old adult might be able to hear 5000Hz, but a teenager from 12-18 could most likely hear a 6000-6500Hz like nothing fazed them.
How were sound effects made before digital recordings?
Sound-on-film has existed since 1927, but it has only been in a digital format since around 1992. Disney films created before then (like all other sound films) recorded the sound effects and music on analog media. It was synchronized onto the film strips using either magnetic (just like a cassette tape) or optical (usually the RCA Photophone) formats. Most 35mm films still include an RCA Photophone track, in case the theater is not equipped to run digital sound or the digital equipment fails.
What are words that describe how fast or slow a sound wave is moving?
The density of the medium through which it is travelling: for example, about 343m/s in air; almost 1500m/s in sea-water.
It is echolocation because just like dolphin the send high pitched squeaks to see if anything bounces off and relects back to see how far away it is. The high pitched squeakes off boats bounce off the ocean floor to see how deep it is.
- 6 dB is incorrect. It will decrease by 12 dB.
Velocity of the sound is maximum in which gas?
That is a difficult question. I would say that the denser the gas, the faster the speed of sound. Since the gas occupies a lot more space, sound energy/waves are transmitted more easily. :D
